How many molecules are present in a 18.0 liter sample of N2O gas at STP? x 10 molecules N₂O 1 mole = 22.4 L at STP Enter the coefficient in the green blank and the exponent in the yellow blank. Report your answer to the appropriate number of significant figures! Coefficient (green) Exponent (Yellow) Enter

How many molecules are present in a 18.0 liter sample of N2O gas at STP? x 10 molecules N₂O 1 mole = 22.4 L at STP Enter the coefficient in the green blank and the exponent in the yellow blank. Report your answer to the appropriate number of significant figures! Coefficient (green) Exponent (Yellow) Enter

Living By Chemistry: First Edition Textbook

1st Edition

ISBN:9781559539418

Author:Angelica Stacy

Publisher:Angelica Stacy

ChapterU3: Weather: Phase Changes And Behaviour Of Gases

Section: Chapter Questions

Problem 9RE

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Potassium peroxide is used to absorb the CO2 produced by the people in a space vehicle. 2K2O2(s)+2CO2(g)2K2CO3(s)+O2(g)If a person at rest exhales 3.0 L of air per minute and CO2 is 3.4% (by volume) of exhaled air, how many grams of K2O2 are needed per person for a five-day trip. Assume a temperature of 250 and 728 mm Hg pressure.
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perform stoichiometric ca1cu1uions for reactions involving gases as reactants or products.
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5-114 Carbon dioxide gas, saturated with water vapor, can be produced by the addition of aqueous acid to calcium carbonate based on the following balanced net ionic equation: (a) How many moles of wet CO (g), collected at 60.°C and 774 torr total pressure, are produced by the complete reaction of 10.0 g of CaCO3 with excess acid? (b) What volume does this wet CO2 occupy? (c) What volume would the CO2 occupy at 774 torr if a desiccant (a chemical drying agent) were added to remove the water? The vapor pressure of water at 60.°C is 149.4 mm Hg.
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94 Mining engineers often have to deal with gases when planning for the excavation of coal. Some of these gases, including methane, can be captured and used as fuel to support the mining operation. For a particular mine, 2.4 g of CH4 is present for every 100.0 g of coal that is extracted. If 45.6% of the methane can be captured and the daily production of the mine is 580 metric tons of coal, how many moles of methane could be obtained per day?
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93 The complete combustion of octane can be used as a model for the burning of gasoline: 2C8H18+25O216CO2+18H2O Assuming that this equation provides a reasonable model of the actual combustion process, what volume of air at 1.0 atm and 25°C must be taken into an engine to burn 1 gallon of gasoline? (The partial pressure of oxygen in air is 0.21 atm and the density of liquid octane is 0.70 g/mL.)
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